Hoisting and load-discharging machine



April 2, 1929.

F. J. SHEPARD, JR., ET AL 1,707,881 HOISTING AND LOAD DISCHARGING MACHINE Filed y 1926 3 Sheets-Sheet l q v I I l 1 l I I I 1 1 a 1| m 8 .H r. 3 m m m .1. 4 o rw E U t 6 S m L o a e O 5 h a k 3 u 4 l. F f I l I W 5 I C qllrl. 5 7 s g 5 r a 5 \O m 4 n w 4 r l 1 1 4 Iv April 1929. F. J. SHEPARD, JR., ET AL 1,707,881

HOISTING AND LOAD DISCHARGING MACHINE Filed May 1926 3 Sheets-Sheet 2 7 S \nvenToYS.

8 Fre derncK d.$hepord Jr b Nuihcmie) wopsha'w A ril 2, 1929. F. J. SHEPARD, JR., ET AL 1,707,331

HOISTING AND LOAD DISCHARGING MACHINE Filed May 5, 1926 3 Sheets-Sheet 3 Fig. 4.

lnvenTors. F'redericKdShepurd Jr. NoThcmiel War-show b WWIKW ys.

Patented Apr. 2, 1929.

UNITED STATES BOSTON, MASSACHUSETTS,

TOWN, MASSACHUSETTS, A CORPORATION LEWIS-SHEPARD COMPANY, OF WATER- OF MASSACHUSETTS.

HOISTING AND LOAD-DISCHABGING MACHINE.

Application filed May 3, 1926. Serial No. 106,365.

This invention relates to improvements in hoisting machines and more particularly to tiering machines for raising articles, such as, barrels, boxes, bales, etc., to a predetermined height so that they can be piled one upon the other, or lowered from a platform or pile, and the general object of the invention is to provide a hoisting machine which will be of a relatively simple construction and more effective and speedy in its operation and more certain in its action than machines heretofore produced.

More particularly the invention relates to means for auton'latically discharging the load from a vertically movable load supporting means when the load supporting means has reached a predetermined position.

A further object of the invention is to provide novel means for automatically reversing the movement of the load supporting means upon the discharge of the load so that the load supporting means will be returned to lowered position.

A further object of the invention is to provide a novel mechanism for controlling a tilting load carrying device operable normally to lock the load carrying device in a stable or load carrying position with means acting first to unlock the load carrying device as it approaches a predetermined height and thereafter to tilt the load carrying device and thereby discharge the load.

A further object of the invention is to provide means operable by the tilting movement of the load carrying device to arrest the up ward movement of the load supporting means when said predetermined elevation is reached.

A further object of the invention is to provide means automatically operable by the return movement of the load carrying device to stable or load carrying position to cause the lowering of the load carrying device.

A further object of the invention is to provide a hoisting machine having a motor operable to raise or lower the load and braking mechanism normally tending to prevent movement of the load carrying device with an electrically actuated brake releasing mechanism operable by the movement of the controller from neutral position, either to starting position or reversing position, to release the brake simultaneously with the starting or reversing of the motor.

device approaching load Another object of the invention is to provide electric and mechanical means for actuating the braking mechanism from the controller of the motor, which is so constructed that the mechanical means and electrical means may be conjointly or alternatively employed.

Other objects and features of the invention will more fully appear from the following description and the accompanying drawings and will be particularly pointed out in the claims.

The invention is illustrated herein as applied to a barrel ticring machine, but it will be understood that the invention may be applied to other forms of hoisting machines within the spirit of the disclosure and claims herein.

In the drawings:

Fig. 1 is a side elevation of a hoisting machine embodying the invention; Fig. 2 is an enlarged detail view, partially in section, on line 22 Fig. 1, and viewed from the left, showing the load supporting means and tilting load carrying device mounted thereon and means for actuating the tilting load carrying device, and showing the load supporting means in its lowest position to receive the barrels or other load;

Fig. 3 is a view, similar to Fig. 2, showing the load supporting means and load carrying discharging position with the tilting mechanism unlocked preparatory to tilting movement; and,

ig. 4 is an enlarged detail view, similar to Fig. 2, showing the load supporting means in load discharging position with the load carrying device tilted to discharge the load.

Fig. 5 is an enlarged detail view of the mechanism for actuating the brake-releasing device.

The hoisting machine illustrated in the accompanying drawings is of the portable type comprising a main frame formed of structural iron and having side girders 1 connected by a suitable transverse girder, said side girders being supported at the rear upon suitable wheels 2 and at the front upon suitable legs 3. Desirably portable elevating aind sheering means (not shown) are provided to raise the front end of the frame so that it may be readily transported from place to place, either when unloaded or loaded. Such means may be and desirably is of the general ty illustrated in Letters Patent No. 1,542,- 067fgranted June 16, 1925 to Lewis-Shepard Company, assignee of Ralph M. Lovejoy.

The main frame also comprises suitable standards or uprights 4 connected to the side frames 1 and connected at their tops to a transverse plate or girder 5 with one or more transverse connecting girders 6. The standards desirably are of channel iron and provide guideways for the vertical load supporting means. The load supporting means as illustrated herein is of L-shaped construction comprising rearwardly extending girders 7 formed of angle iron with the horizontal flanges 8 thereof projecting inwardly toward each other and transverse girders 9 and 10, desirably of channel iron, resting upon the horizontal flanges 8 of the rearwardly extending girders. The L-shaped frame also comprises vertically extending members 11 which are rigidly secured to the rearwardly extending irders 7 and extend upwardly in parallehsm with, and in juxtaposition to, the standards 4. Wheels or rollers 12 and 13, engaging respectively the rear and front faces of the flanges of the standards 4, serve as guides for the load supporting means to direct it in its upward and downward movement. The upwardly extending members 11 are connected by transverse plates of structural iron 14 and 15 with suitable brace rods 16 adapted to re-enforce the structure of the load supporting means.

Suitable mechanism is provided for raising and lowering the load supporting means. A s illustrated herein the. hoisting device comprises a cable 17 which is secured to the central portion of the frame of the load supporting means and extends upwardly over a sheave 18 which is mounted in a frame 19 carried between the transverse girders 6 and top plate 5. The cable passing over the sheave 18 is wound upon a Windlass 20 which is journalled in suitable'bcarings in a preferably detachable supplementary frame comprising vertical channel bars 21 and 22. which are connected together at the bottom by angle iron bars 23 which are adapted to be bolted to the main frame and at the top by a plate 23 which is bolted to the horizontal flange of an angle iron bar. the vertical flange of which is secured, preferably by welding, to the uprights 4.

The shaft of the winding drum has fixedly secured to it a worm gear 25 which is enclosed in a gear casing which is mounted on the windlass shaft. The worm gear is operated by a worm 26 upon a shaft 27 which is journalled in bearings in the gear casing and provided with a sprocket gear 28 driven through a sprocket chain 29 from a sprocket pinion 30 upon the shaft of an electric motor 31 which is mounted upon a platform of the supplemental frame. The shaft 27 is provided with a brake drum 32 with which a pair of brake shoe straps 33 co-operate, said straps desirably being in two sections adjustably secured together at their lower ends and at their upper ends respectively secured to the lower ends of bell crank levers 34 and 35 which are pivotally mounted upon studs extending from the gear casing. The upwardly extending arms of said levers are engaged by the opposite ends of a spring 36 which acts to separate the upper ends of said levers, thereby forcing their lower ends together in such a manner as to apply the brake to the brake drum.

The bell crank levers 34 and 35 are provided respectively with arms 34* and 35 which extend substantially horizontally from their fulcrums toward each other and preferably overlap at. their juxtaposed ends. The overlapping ends of these arms are engaged by one end of a brake-releasing lever 37 which is operable by the movement of the controller lever in either direction from neutral position, so that the brake is released simultaneously with the energization of the motor either to rotate the Windlass drum in a winding up direction or an unwinding direction.

One of the objects of the present invention is to provide means by which the brake-releasing means may be actuated mechanically by the movement of the controller arm or in which such actuation may be supplemented or may selectively be wholly accomplished by the action of a solenoid, the energization of which is controlled by the movement of the controller arm from neutral position.

In the preferred embodiment of the invention illustrated herein the end of the brake 1 releasing member 37 is adjustably connected to the lower end of a non-magnetic link 38, of brass or of a suitable non-magnetic material, which is pivotally connected at its upper end to the lower end of the core 39 of a solenoid 40 which is suitably mounted upon the supplemental frame of the machine. The upper end of the solenoid core is pivotally connected by a link of non-magnetic material to the end of an arm or extension 41 of the usual controller lever 42. Such mechanical connection between the brake releasing lever 37 and the arm 41 may, however, if desired be independent of the solenoid core.

The shaft of the controller is provided with theusual contact sector a adapted, when the controller lever 42 is swung to the left from neutral position illustrated in Fig. 1, to en- .llO

gage a contact Z) in the usual circuit through the motor, not shbwn, and thereby to cause the motor to rotate the Windlass drum in a winding up direction. When the controller lever is swung to the right from neutral position it engages the contact 0 and thus completes the circuit in the motor in the reverse direction thereby causing the motor to rotate the Windlass in an unwinding direction. Suitable conductors 03 lead from the contacts Z) and c to one end of the winding of the solenoid, the other end of the solenoid winding being connected to the return lead of the power circuit, not shown. Thus the solenoid Wlll be energized simultaneously with the actuation of the motor when the controller arm is moved either to elevating or reversing position.

The solenoid when thus energized will raise its core and through it the end of the lever 37 to which the core is connected thereby depressing the other end of the lever 37 upon the overlapping arms 34*, 35" of the levers 34 and 35 thus causing them to swing about their fulcrums against the action of the spring 36 and releasing the brake bands from engagement with the brake drum.

Inasmuch as the core of the solenoid is connected to the extension 41 of the controller ever and also to the lever 37 a mechanical means is also provided for actuating the brake releasing lever as the vertical component of the short are of movement of the end of the arm 41 of the controller lever is suflicient to actuate the brake releasing lever enough to remove the brake band from effective engagement with the brake drum. Thus the brake releasing mechanism is under a combined electrical and mechanical control in which the action of the solenoid relieves the force which otherwise would be necessary to be applied to the controller lever to actuate the brake releasing means.

The presence of the mechanical means for releasing the braking mechanism ensures the operativeness of this mechanism in case of.

breakage of or other defect in the solenoid circuit.

A switch 6 may be provided in the solenoid circuit by means of which the solenoid may be cut out if desired. Preferably the link connecting the solenoid core to the arm 41 of the controller lever is detachable so that by disconnecting this link from the arm 41 the solenoid alone may be used to actuate the brake releasing mechanism .if it is desired to do away with the mechanical connection.

lVhere a manually operated Windlass is employed instead of a power driven Windlass a similar control lever suitably mounted upon the windless frame and having a similar mechauical connection to the brake releasing lever may be employed to control the brake releasing mechanism as will be readily understood.

The tilting load carrying device.

- Another feature of the invention comprises means automatically operable by the tilting movement of the load carrying device when moved in one direction to return the controller, which has been manually operated to raise the load, to neutral position and when tilted in the opposite direction to move the controller to reverse position and thereby to' cause the lowering of the load supporting means as will hereinafter more fully appear.

The tilting load carrying device is pivotally mounted u on the load supporting means. The loa carrying device as illustrated herein comprises a platform 43 Which desirably is inclined from its ends toward its center and is provided with side flanges 44. It has secured intermediate of its ends two or more angle iron girders 45 which are pivoted by means of a shaft 46 in brackets 47 which are mounted upon the transverse girders 9 and 10 of the load supporting means. Countel-balancing means tends normally to maintain the load carrying device in load supporting position. The preferred form of counterbalaneing means illustrated herein comprises a spring 48 which is connected at its lower end to the horizontal member 8 of the rearwardly extending girder 7 of the load supporting means and at its other end to a bracket 49 upon one end portion of the load carrying device.

One of the principal features of this construction consists in the provision of a means for tilting the load carrying device which is also operable to lock the load carrying device in stable or load carrying position. The preferred form of mechanism for accomplishing this purpose, which is illustrated herein, comprises'a toggle joint mechanism which connects the load supporting means to the load carrying device and which is operable when the toggle members are in substantially extended position to lock the load carrying device against tilting movement in either direction. I, This toggle mechanism is, however, operable upon breaking or retraction of the toggle joint to tilt downwardly the end of the load carrying device to which it is attached so that the load will be discharged.

1 The particular mechanism illustrated in the drawings for accomplishing this purpose comprises a rock shaft 50 which is journalled in suitable bearings in the transverse members 9 and 10 of the load supporting means and has secured to it a toggle joint member comprising a sleeve portion 51 which is fixedly secured to the shaft and is provided with upwardly extending arms 52 having near their ends journals to receive a pi"ot rod 53. The other toggle joint member, as illustrated herein, comprises two similar yoke-shaped members 54 having arms 55 which are pivotally connected to the rod 53 and oppositely extending central bosses 56 which are pivotally mounted upon a rod 57 which is mounted in brackets 58 depending from the load carrying device. The rock shaft 50 preferably extends beyond its journal in the transverse girder 9 in proximity to the end of the horizontal portion of the load supporting means adjacent to the vertical uprights and is provided with 'an actuating arm 59. The actuating arm 59, which is secured to the rock shaft, desirably is of curved or arcuate form and is equipped at its end with an anti-friction roller 60 which is adapted to be engaged by a cam 61 carried by a bracket 62 which may be secured in any desired adjusted position to one of the vertical uprights 4. The cam 61, which is illustrated in Figs. 3 and 4, curves inwardly from its lower end toward the vertical standards and may be of only such length as is necessary to break the toggle lock and to retract the toggle joint sufiiciently to tilt the platform enough to initiate the discharging movement of the barrel or other load. The remainder of the tilting movement may be performed by the weight of the load as it rolls downwardly toward the lower end of the tilting load carrying device.

After the load is discharged from the load carrying device it is returned to its stable or load carrying position by the action of the counterbalancing mechanism which, as illustrated, is the spring 48. The return tilting movement of the load carrying device restores the toggle joint to its substantially extended position, as illustrated in Fig. 2, desirably carrying the knee of the toggle joint slightly beyond a plane passing through the axes of the pivotal shafts 50 and 57 so that the knee of the toggle will rest upon an abutment 63 upon one of the rearwardly extending girders 7 of the load supporting means, as illustrated in Fig. 2.

In order to aid in the operation of the toggle joint tilting and locking device the arm 59 is provided with a lateral extension 64 located in proximity to the rock shaft 50 and a helical spring 65 is secured to the end of this arm and to one of the vertical members 11 of the load sup orting means. The relative proportions 0 the extension and toggle links are such that when the toggle joint is in substantially extended position, illustrated in Fig. 2, the spring acts upon one side of a plane passing through the shaft 57 and the rod 53 forming the pintle of the knee of the toggle, so that the spring 65 acts to hold the toggle links in locking position. lVhen, however, the toggle joint is retracted, as illustrated in Fig. 4, the line of action of the spring 64 is intermediate of the position of the shaft 53 and the shaft 57, thus tending to hold the toggle joint in collapsed position. The action of the spring 65, therefore, supplements the movement of the toggle or tilting device, both in holding the toggle in collapsed position, as illustrated in Fig. 3, and in forcing the toggle joint toward the locking position illustrated in Fig. 2.

Suitable means may be provided to limit the tilting movement of the load carrying device. A preferred mechanism which is shown in the drawings comprises an L shaped bracket or girder having a foot 66 adapted to be adjustably secured by a bolt 67 passing through one of several bolt holes 68 in an upper flange of one or both of the transverse girders 9 and 10 of the load supporting means, the upwardly extending member 69 of the bracket or girder being adapted to be engaged by the under face of the load supporting means when it is tilted to d1scharge the load. By adjusting the position of this bracket or girder toward and from the discharging end of the load carrying device the maximum tilted position of the load carrying device may be regulated.

Another important feature of the invention consists in providing means operable by the tilting movement of the platform to arrest the upward movement of the load supporting means when the desired position of elevation is reached and which is also operable to reverse the action of the motor to lower the load supporting means when the load has been discharged. Various mechanisms may be utilized to perform this function. As illustrated in the drawings the controller arm 42 is connected by an adjustably extensible link 70 to one arm 71 of a bell crank lever which is pivotally mounted upon a bracket 72 carried by the upright 4 or by the supplemental frame. The other arm 73 of the bell crank lever is adapted to be engaged by collars 74 and 75 located upon opposite sides of the arm 73 and secured to an endless controlling cable 76 which passes over suitable pulleys 77, 78, 79 and 80 at the upper and lower ends of the vertical standard and which is provided with stop members 81 and 82 which, as shown, are in the form of balls which may be adjustably secured to the cables at such position as will limit the elevating and lowering movements of the load supporting means. This controlling cable may be operated by hand by a workman standing upon the load supporting means to control the raising and lowering of the load supporting means as a downward pull upon the section of the cable upon which the stops 81 and 82 are secured will raise the arm 73 of the bell crank lever, thus shifting the controller to the left, as illustrated in Fig. 1, and upon an upward pull of the same lead of the cable will cause the controlling lever 42 to be pulled toward the right. Thus an operator standing upon the load supporting means is able to start, stop or reverse the motor and consequently fully to control the movement of the'load supporting means.

The present invention comprises means automatically operable by the movement of the load supporting means and of the tilting load carrying device to control the movement of the load supporting means. As illustrated herein one of the vertical members 11 of the load supporting means is provided with a laterally extending arm 83 having an apertured or bifurcated end 84 through which the controlling cable 7 6 passes. This arm 83 is adapted upon downward movement of the load supporting means to en age the lower stop member 81 and upon furt 1er downward movement of the load supporting means to depress the stop member, thereby causing the collar 7 4 to raise the arm 73 of the bell crank lever and move the controller 42 from the starting position, shown in dotted lines at the left of neutral position to the neutral position illustrated in full lines.

The mechanism for'arresting the upward movement of the load supporting means, when a predetermined position of elevation. is reached and to reverse the movement after the discharge of the load supporting means, comprises a lever 85 which is pivotally mounted upon a stud 86 projecting rearwardly from the vertical member 11 of the load supporting means. The outer end 87 of the lever 85 is bifurcated or apert-ured to permit the cable 76 to pass therethrough. The opposite end of the lever 87 is connected to a link 88, preferably in the form of a rod, the lower end of which passes freely through an aperture 89 in the horizontal extension 90 of a bracket upon the load carrying device and is provided with a stop nut or nuts 91 which engage the under face of the bracket 90 when the load carrying device is in stable or load carrying position illustrated in Figs. 2 and 3.

In the operation of this mechanism the up-.

ward movement of the load supporting means causesthe end 87 of the lever 85 to engage the upper stop member 82 upon the cable 76 as the predetermined limit of upward movement of the load supporting means is approached so that further upward movement of the load supporting means would, if the lever 85 were held rigidly, restore the controller lever to neutral position. However, about the time the lever 85 engages the stop member 82 the roller upon the arm 59 of the tilting mechanism is engaged by the cam 61 and the tilting of the load carrying-device initiated. This tilting of the load carrying device brings the bracket 90 on the load carrying device out of engagement with the nuts 89 upon the link 88 so that the end 87 of the lever 85 yields upon engagement with the stop 82 until the lever 85 reaches and is supported by the rigid laterally extending stop actuating arm 83. Thereafter the upward movement of the load supporting means raises the stop member 82 and causes the cable to move the controller lever to neutral osition as above described, thus arresting tl ie upward movement of the load supporting means. During this stopping movement, however, the tilting of the load carrying device has been progressing so that while the load carrying device is arrested at a predetermined elevation the load is ready to be, or in the act of being, discharged from the load carrying device. As soon as the load has been discharged from the load carrying device the load carrying device is returned to load carrying position and as it moves toward horizontal or load carrying position the bracket extension 90 on the load carrying device engages the nuts 91 on the link 88, de ressing the link and swinging the lever 85 rom the position illustrated in Fig. 4 toward the position illustrated in Figs. 2 and 3. This movement of the lever 85, the load supporting means being stationary, lifts upon the stop member 82 of the controlling cable 76, thus causin the collar 75 further to depress the bel crank arm 73, thereby moving the controller arm 42 to the dotted position at the right Fig. 1, thereby reversing the motor and cansing the lowering of the load supporting means until the arm 83 again engages the lowest stop member 81.

It will be obvious that by reason of this construction the tilting action of the load carrying device is utilized both to arrest the upward movement of the load supporting means and to reverse the action of the motor and thereby causing the lowering of the load. The action of this mechanism is merely dependent upon the time it takes to discharge the load so that a very speedy operation of the machine in discharging its load and returning to lowered position is attained. The mechanism is of a substantial and rugged character and not likely to become injured. The parts may be made of sufficient strength to withstand hard usage and may be relied upon to act efficiently at all times, a consideration which is of great importance in elevating machines of this character which are called upon to handle widely varying loads and in which an operation of maximum speed is desirable.

It will be understood that the embodiment of the invention disclosed herein is of an illustrative character and is not restrictive and that various changes in form, construction and arrangement of parts may be made within the spirit and scope of the following claims.

Having thus described the invention, what is claimed as new, and desired to be secured by Letters Patent, is:

1. A hoisting machine comprising vertically movable load supporting means having a tilting load carrying device mounted thereon, means for elevating said load supporting means, means for tilting said load carrying device operable also to lock the same inload carrying position and means operable when the load supporting means approaches a predetermined elevation to unlock said tilting means and cause the same to tilt the load carrying device to discharging position.

2. A hoisting machine comprising vertically movable load supporting means having a tilting load carrying device mounted thereon, means for elevating said load supporting means, means for tilting said load carrying device operable also to lock the same in load carrying position, means operable when the load supporting means approaches a predetermined elevation to unlock said tilting means and cause the same 'to tilt the load carrying device to discharging positionand means operable upon discharge of the load to return said load carrying device to load carrying position and said tilting device to locking position.

3. A hoisting machine comprising vertically movable load supporting means having a tilting load carrying device mounted thereon, means for elevating said load supporting means, means for tilting said load carrying device operable also to lock the same in load carrying position, means operable when the load supporting means approaches a predetermined elevation to unlock said tilting means and cause the same to tilt the load carrying device to discharging posit-ion and means controlled by the tilting movement of said load carrying device operable temporarily to arrest theupward movement of said load supporting means while the load is being discharged.

4. A hoisting machine comprising vertically movable load supporting means having a tilting load carrying device mounted thereon, elevating means operable to raise and to lower said load supporting means, means for tilting said load carrying device also operable to lock the same in load carrying position, means operable when the load supporting means approaches a predetermined elevation to unlock said tilting means and cause the same to tilt the load carrying device to discharging position, means operable upon discharge of the load to return said load carrying device to load carrying position and said tilting means to locking position and means operable by the tilting movement of said load supporting means while the load is being discharged and upon the return movement of said tilting load carrying device to cause said elevating means to lower the load supporting means.

5. A hoistingmachine comprising vertically movable load supporting means having a tilting load carrying device mounted thereon, means for elevating said load supporting means, toggle joint mechanism having members connected respectively to one end portion of said tilting load carrying device and to said load supporting means, operable when in substantially extended position to lock said load carrying device in load carrying position and when retracted to tilt said load carrying device to discharging position and means operable when the load supporting means approaches a predetermined elevation to retract said toggle joint.

6. A hoisting machine comprising vertically movable load supporting means having a tilting load carrying device mounted thereon, means for elevating said load supporting means, toggle joint mechanism having members connected respectively to one end portion of said tilting load carrying device and to said load supporting means, operable when in substantially extended position to lock said load carrying device in load carrying posi tion and when retracted to tilt said load carrying device to discharging position, means operable when the load supporting means approaches a predetermined elevation to retract said toggle joint and means acting upon said toggle joint tending to restore the toggle to, and to retain the same in, locking position.

7. A hoisting machine comprising vertically movable load supporting means having a tilting load carrying device mounted there on, means for elevating said load supporting means, toggle joint mechanism having members connected respectively to one end portion of said load carrying device and to said load supporting means, operable when in substantially extended position to lock said load carrying device in load carrying position and when retracted to tilt said load carrying device to discharging position, means operable when the load supporting means approaches a predetermined elevation to retract said toggle joint and a spring intermediate of said load carrying device and said load supporting means acting to restore said load carrying device to load carrying position upon discharge of the load.

8. A hoisting machine comprising vertically movable load supporting means having a tilting load carrying device mounted thereon, a motor, means operable thereby for raising and lowering the load supporting means, a brake normally tending to arrest the move ment of said load carrying device, a controller for said motor, means operable by the 'movement of said controller toward elevating or reversing position torelease said brake, means operable when the load supporting means approaches a predetermined elevation to tilt said load carrying device and means controlled by such tilting movement operable by continued upward movement of said load supporting means to restore the controller to neutral position and thereby permit said brake to arrest the load supporting means while the load is being discharged.

'9. A hoisting machine comprising vertically movable load supporting means having a tilting load carrying device mounted thereon, a motor, means operable thereby for raising and lowering the load supporting means, a brake normally tending to arrest the movement of said load carrying device, a controller for said motor, means operable by the movement of said controller toward elevating or reversing position to release said brake,

to tilt said load carrying device, means operable by continued upward movement of said load supporting means to restore the controller to neutral position and thereby permit said brake to arrest the load supporting means while the load is being discharged, means operable upon discharge of the load to return the load carrying device to load carry ing position and means actuated by said returning movement to move said controller to reverse position whereby the load supporting means will be lowered. I

10. A hoisting machine comprising vertically movable load supporting means having a' tilting load carrying devicecmounted thereon, a motor, means operable thereby for raising and lowering the load supporting means, a brake normally tending 'to arrest the bers connecte movement of said load carrymg device, a controller for said motor, means operable by the movement of said controller toward elevating or reversing position to release said brake, toggle 'oint mechanism having memd' respectively to one end portion of said load carrying device and to said load supporting means operable when in substantially extended position to lock said load carrying device in load carryin position and when retracted to tilt said loa carrying de- .Vice to discharge the load and means controlled by such tilting movement operable by continued upward movement of said load supporting means to restore the controller to neutral position and thereby arrest the load supportmg means while the load isbeing discharged. 11. A hoisting machine comprising vertically movable load supporting means having a ti ting load carrying evice mounted thereon, a'motor, means operable thereby for raisin and lowering the load supporting means, a brake normall tending to arrest the movement of said loa carrying device, a controller for said motor, means operable by the movement of said controller toward elevating or reversing position to release said brake,-toggle joint mechanism having members con nected respectively to one end portion of said load carrying device and to said load supporting means operable when in substantially extended position to lock said load carrying device in load carrying position and when renected respectively to one en tracted to tilt said load carrying device to discharge the load, means operable by continued upward movement of said load supporting means to restore the controller to neutral position and thereby arrest the load supporting means while the load is being discharged and means acting to restore the load carrying device to load carrying position upon the discharge of the load and means operable by the return movement of the load carrying device to move said controller to reverse dlrection and'thereby cause the lowering of the load supporting means.

12. A hoisting machine comprising vertically movable load supporting means having a tilting load carrying device mounted thereon, a motor, means operable thereby for raising and lowering the load supporting means, a brake normall tending to arrest the movement of said load carrying device, a controller for said motor, means operable by the move ment of said controller toward elevating or reversing position to release said brake, toggle joint mechanism havin members con- 5 portion of said load carrying device and to said load supporting means operable when in substantially extended position to lock said load carrying device in load carrying position and when retracted to tilt said load carrying device to discharge the load, means operable to tilt said load carrying device when the load supporting means approaches a predetermined position, means for actuating said controller, a lever mounted upon said load supporting means positioned to engage said controller actuating means when the platform approaches said predetermined position and operable by continued upward movement of said load supporting means, when the load supporting means has reached said predetermined position, to return the controller to neutral position and means operable by the return tilting movement of the load carrying device, after the discharge of the load, to cause said lever to move the controller to reverse position.

In testimony whereof, we have signed our names to this specification.

FREDERICK J. SHEPARD, JR. NATHANIEL WARSHAW. 

